Related Parts: Boom End Swivel (12-0800003) Boom End Sheave Shaft (12-0700056) Fits: Century Express 30 0 Series (03/1998 - Current) Century EB4 Express (03/1999 to Current) Century EB4 6500 (01/1998 - Current) Century Formula I, Duplex Tilt, 411 & 412 Wreckers Century Formula I, Duplex Tilt, Super Six & 500 Series Century Formula 6000, 600 Series Centur y Formula 6500, 600 Series REV A Century 211 & 212 (Prior to 1997) Century 211 & 212 (11/1997 to Current) Century 614 FIIT Alu minum Body (07/2007 to Current) Century 614 Wrecker Formula IIT REV A (04/2002 to Current) Century 712 & 716 Wrecker Formula III T (04/1997 to Current) Challenger Express 4300 Series (03/1998 - Current) Challenger 4700 Series (02/1995 - Current) Challenge r 4800 Series (06/1995 to Current) Champion Model 101 (09/1994 - Current) Holmes 440 Series / DFT 400 (10/1994 - Current) Produ ct Dimensions: 6"L x 6"H x 1.5"H Outside Diameter: 6"